TRM - Ba, Bi, Ce, Co, In, Li, U - Aqueous calibration solution ASTASOL® TUNE08P

Significance of the topic

Aqueous multi-element calibration standards are fundamental tools in analytical chemistry, ensuring accurate quantification of trace metals across various spectrometric and electroanalytical techniques. Reliable reference materials support method validation, instrument calibration, and quality control in environmental monitoring, pharmaceuticals, food safety, and industrial processes.

Objectives and overview of the study

This identification sheet describes the preparation, characterization, and intended use of the ASTASOL® TUNE08P reference solution. The document aims to provide users with comprehensive information on composition, concentration values, uncertainty, traceability, homogeneity, stability, and handling instructions.

Methodology and Instrumentation

The aqueous calibration solution was gravimetrically prepared using high-purity primary compounds (BaCO3, Bi, Ce(NO3)3·6H2O, Co, In, Li2CO3, UO2(NO3)2·6H2O) and ultra-pure acids (sub-boiling distilled HNO3 and HCl) diluted in ultrapure water (≥18 MΩ·cm). Concentrations of Ba, Bi, Ce, Co, In, Li, and U were assigned at 1.00 μg/L with an expanded uncertainty of ±0.05 μg/L (k=2) at 20 °C. Traceability was established through CRM comparisons (AAS, AES, ICP-OES) to NIST SRMs via a short unbroken calibration chain.

Main results and discussion

The reference material demonstrated excellent homogeneity and stability over its shelf life when stored between 5–30 °C in the original closed bottle. Trace impurities remain below 0.02 μg/L total. Users are instructed to equilibrate the solution to 20 ±0.5 °C before use, avoid pipetting directly from the bottle, and prevent vapor losses by applying a parafilm layer to the cap after each opening. The solution remains valid until the expiry date, provided recommended handling practices are followed.

Benefits and practical applications of the method

• Enables precise calibration for atomic spectrometry (AAS, AES, ICP-OES, ICP-MS), molecular absorption spectrometry, and selected electroanalytical methods
• Simplifies multi-element analysis by providing uniform concentration levels across key analytes
• Supports regulatory compliance and method validation in QA/QC laboratories

Future trends and potential applications

Advances in micro-sample analysis and hyphenated techniques (e.g., coupling of chromatography with ICP-MS) will drive demand for tailored multi-element standards with lower detection limits and expanded analyte panels. Development of matrix-matched and species-specific reference materials may further enhance method accuracy in complex samples.

Conclusion

ASTASOL® TUNE08P offers a rigorously characterized multi-element calibration solution with traceable concentration values and robust quality attributes. Its homogeneity, stability, and straightforward handling make it a reliable calibrator for diverse analytical workflows, contributing to reproducible and accurate trace metal determinations.

References

• ISO Guide 31: Reference Materials – Contents of Certificates and Labels
• ISO 9001:2016 – Quality Management Systems
• ISO 17034:2017 – General Requirements for Competence of Reference Material Producers
• NIST SRMs used for traceability